Install Instructions

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Q. Adjust Thermostats
Adjust the heating and indirect water heater thermostats
to their nal set points.
R. Field Conversion From Natural Gas to LP Gas
Alpine Series boilers are factory shipped as Natural Gas
builds. Follow steps below for eld conversion from
Natural Gas to LP Gas.
WARNING
This conversion should be performed by a
qualied service agency in accordance with the
manufacturer’s instructions and all applicable
codes and requirements of the authority
having jurisdiction. If the information in these
instructions is not followed exactly, a re, an
explosion or production of carbon monoxide may
result causing property damage, personal injury,
or loss of life. The qualied service agency is
responsible for proper conversion of these boilers.
The conversion is not proper and complete until
the operation of the converted boiler is checked
as specied in this manual.
1. All Alpine boiler models can be converted from
Natural Gas to LP Gas.
2. Conversion of Alpine Series boilers from one fuel
to another is accomplished using the throttle screw
on the gas valve. Figure 53 shows the location of
the throttle screw on the Dungs valve. Locate the
throttle on the boiler being converted.
3. If conversion is being made on a new installation,
install the boiler in accordance with the installation
instructions supplied with the boiler. If an installed
boiler is being converted, connect the new gas
supply to the boiler, check for gas leaks, and purge
the gas line up to the boiler in accordance with
the National Fuel Gas Code (ANSI Z223.1) or the
requirements of the authority having jurisdiction.
4. Before attempting to start the boiler, make the
number of turns to the throttle screw called for in
Table 28.
5. Attempt to start the boiler using the lighting
instructions located inside the lower front cover of
the boiler. If the boiler does not light on the rst
try for ignition, allow to boiler to make at least
four more attempts to light. If boiler still does not
light, turn the throttle counter clockwise in 1/4 turn
increments, allowing the boiler to make at least
three tries for ignition at each setting, until the boiler
lights.
6. Go back to Paragraph L “Checking/Adjusting Gas
Input Rate” and Paragraph M “Perform Combustion
Test”.
Table 28: Number of Clockwise Throttle Screw
Turns for LP Conversion
Boiler Model Gas Valve
Throttle Screw Turns at
Altitude Range
0 - 7000 Ft.
ALP080B
Dungs
GB-055
(½” NPT)
2¾
ALP105B 4
ALP150B 3¼
ALP210B 4
ALP285B
Dungs
GB-057
(¾” NPT)
4½
ALP399
Dungs
GB-057 HO
(¾” NPT)
1¾
Figure 53: Dungs Gas Valve Detail
IX. System Start-up (continued)